WO2011021380A1 - 端末装置及び信号送信制御方法 - Google Patents

端末装置及び信号送信制御方法 Download PDF

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Publication number
WO2011021380A1
WO2011021380A1 PCT/JP2010/005071 JP2010005071W WO2011021380A1 WO 2011021380 A1 WO2011021380 A1 WO 2011021380A1 JP 2010005071 W JP2010005071 W JP 2010005071W WO 2011021380 A1 WO2011021380 A1 WO 2011021380A1
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Prior art keywords
signal
resource
response signal
unit
terminal
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PCT/JP2010/005071
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English (en)
French (fr)
Japanese (ja)
Inventor
中尾正悟
西尾昭彦
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パナソニック株式会社
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Priority to EP10809727.0A priority Critical patent/EP2469950B1/de
Priority to US13/390,202 priority patent/US8837402B2/en
Priority to JP2011527578A priority patent/JP5526135B2/ja
Publication of WO2011021380A1 publication Critical patent/WO2011021380A1/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1692—Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network

Definitions

  • the present invention relates to a terminal device and a signal transmission control method.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SCH Synchronization Channel
  • BCH Broadcast Channel
  • the terminal first secures synchronization with the base station by capturing the SCH. Thereafter, the terminal acquires parameters (eg, frequency bandwidth) unique to the base station by reading the BCH information (see Non-Patent Documents 1, 2, and 3).
  • the terminal establishes communication with the base station by making a connection request to the base station after the acquisition of the parameters unique to the base station is completed.
  • the base station transmits control information via a PDCCH (Physical ⁇ Downlink Control CHannel) as necessary to a terminal with which communication has been established.
  • PDCCH Physical ⁇ Downlink Control CHannel
  • the terminal performs “blind determination” for each of the plurality of control information included in the received PDCCH signal. That is, the control information includes a CRC (Cyclic Redundancy Check) part, and this CRC part is masked by the terminal ID of the transmission target terminal in the base station. Therefore, the terminal cannot determine whether or not the received control information is control information destined for the own device until the CRC part of the received control information is demasked with the terminal ID of the own device. In this blind determination, if the CRC calculation is OK as a result of demasking, it is determined that the control information is addressed to the own device.
  • CRC Cyclic Redundancy Check
  • ARQ Automatic Repeat Request
  • the terminal feeds back a response signal indicating an error detection result of downlink data to the base station.
  • BPSK Binary Phase Shift Shift Keying
  • PUCCH Physical-Uplink-Control-Channel
  • the base station transmits retransmission data to the terminal.
  • the control information (that is, downlink allocation control information) transmitted from the base station includes resource allocation information including resource information allocated to the terminal by the base station.
  • the PDCCH is used for transmitting the control information.
  • This PDCCH is composed of one or a plurality of L1 / L2 CCHs (L1 / L2 Control Channel).
  • Each L1 / L2CCH is composed of one or a plurality of CCEs (Control Channel Element). That is, CCE is a basic unit for mapping control information to PDCCH.
  • one L1 / L2CCH is composed of a plurality of CCEs, a plurality of continuous CCEs are allocated to the L1 / L2CCH.
  • the base station allocates L1 / L2 CCH to the resource allocation target terminal according to the number of CCEs required for reporting control information to the resource allocation target terminal. Then, the base station maps the physical resource corresponding to the CCE of this L1 / L2CCH and transmits control information.
  • each CCE is associated with the PUCCH configuration resource on a one-to-one basis. Therefore, the terminal that has received the L1 / L2CCH can implicitly specify the configuration resource of the PUCCH corresponding to the CCE that configures the L1 / L2CCH, and uses this specified resource to transmit a response signal. Transmit to the base station. Thus, downlink communication resources are efficiently used.
  • a plurality of response signals transmitted from a plurality of terminals include a ZAC (Zero Auto-correlation) sequence having a Zero Auto-correlation characteristic on the time axis, a Walsh sequence, and a DFT ( Discrete Fourier Transform) sequence and code-multiplexed in PUCCH.
  • ZAC Zero Auto-correlation
  • W 1 , W 2 , W 3 represents a Walsh sequence with a sequence length of 4
  • (F 0 , F 1 , F 2 ) represents a DFT sequence with a sequence length of 3.
  • an ACK or NACK response signal is first spread in a 1SC-FDMA symbol by a ZAC sequence (sequence length 12) on the frequency axis.
  • the response signal after first spreading is subjected to IFFT (Inverse Fast Fourier Transform) corresponding to W 0 to W 3 and F 0 to F 2, respectively.
  • IFFT Inverse Fast Fourier Transform
  • a response signal spread by a ZAC sequence having a sequence length of 12 on the frequency axis is converted into a ZAC sequence having a sequence length of 12 on the time axis by the IFFT.
  • the signal after IFFT is further subjected to second order spreading using a Walsh sequence (sequence length 4) and a DFT sequence (sequence length 3).
  • the base station can separate a plurality of response signals that are code-multiplexed by using conventional despreading processing and correlation processing (see Non-Patent Document 4).
  • LTE-A system The 3GPP LTE-Advanced system
  • LTE system follows the 3GPP LTE system (hereinafter sometimes referred to as “LTE system”).
  • LTE-A system a base station and a terminal capable of communicating in a wideband frequency of 40 MHz or more are expected to be introduced in order to realize a downlink transmission speed of 1 Gbps or more at the maximum.
  • the bandwidth for the LTE-A system is changed to LTE. It is divided into “unit bands” of 20 MHz or less, which is the support bandwidth of the system. That is, the “unit band” is a band having a maximum width of 20 MHz, and is defined as a basic unit of the communication band. Furthermore, the “unit band” (hereinafter referred to as “downlink unit band”) in the downlink is a band delimited by downlink frequency band information in the BCH broadcast from the base station, or the downlink control channel (PDCCH) is a frequency.
  • the “unit band” (hereinafter referred to as “downlink unit band”) in the downlink is a band delimited by downlink frequency band information in the BCH broadcast from the base station, or the downlink control channel (PDCCH) is a frequency.
  • the “unit band” in the uplink is a band delimited by uplink frequency band information in the BCH broadcast from the base station, or a PUSCH (Physical-Uplink) near the center. It may be defined as a basic unit of a communication band of 20 MHz or less including a Shared (CHAnel) region and including PUCCH for LTE at both ends.
  • the “unit band” may be expressed as “Component Carrier (s)” in English in 3GPP LTE-Advanced.
  • the above-described uplink control channel may be expressed as SR (Scheduling Request) (SRI: Scheduling Request Indicator) which is an uplink control signal indicating the generation of uplink data to be transmitted from the terminal side.
  • SR resource a resource to be used for SR transmission
  • OOK On-Off-Keying
  • the base station side determines the SR from the terminal based on whether or not the terminal transmits an arbitrary signal using the SR resource. Is detected.
  • spreading using a ZAC sequence, a Walsh sequence, and a DFT sequence is applied to SR similarly to the response signal described above.
  • SR and response signal may occur within the same subframe.
  • the PAPR Peak-to-Average-Power-Ratio
  • the terminal since the amplifier efficiency of the terminal is regarded as important, when the SR and the response signal are generated in the same subframe on the terminal side, the terminal should use the resource (hereinafter, referred to as the resource to be transmitted).
  • the response signal is transmitted using SR resources individually allocated in advance for each terminal without using ACK / NACK resources).
  • the base station side detects the SR from the terminal side based on whether or not the SR resource is used. Further, on the base station side, based on the phase of the signal transmitted with the SR resource (or the ACK / NACK resource when SR resource is not used) (that is, the BPSK demodulation result), the terminal performs ACK or NACK. Determine which one was sent.
  • the terminal includes a plurality of transmission antennas, and SCTD (Space Code Transmit Diversity.) Using a plurality of different code resources for the SR or response signal.
  • SCTD Spatial Orthogonal-Resource Transmit Diversity
  • SCTD Spatial Orthogonal-Resource Transmit Diversity
  • the base station allocates two ACK / NACK resources to one response signal, and the terminal transmits the same response signal respectively allocated to different code resources by two antennas (non-patent). Reference 5).
  • 3GPP TS 36.211 V8.7.0 “Physical Channels and Modulation (Release 8),” March 2009
  • 3GPP TS 36.212 V8.7.0 “Multiplexing and channel coding (Release 8)”
  • March 2009 3GPP TS 36.213 V8.7.0, “Physical layer procedures (Release 8),” March 2009 Seigo Nakao, Tomofumi Takata, Daichi Imamura, and Katsuhiko Hiramatsu, “Performance enhancement of E-UTRA uplink control channel in fast fading environments,” Proceeding of IEEE VTC 2009 spring, April.
  • the SR resource and the ACK / NACK resource have the same format, and when the SR and the response signal are transmitted simultaneously, the terminal transmits the response signal using the SR resource.
  • SCTD when SCTD is applied to the transmission of the SR and the response signal, it is necessary to prepare a plurality of ACK / NACK resources and SR resources, and the overhead of the uplink control channel (PUCCH) increases.
  • PUCCH uplink control channel
  • the base station uses the L1 / L2CCH (channel constituted by one or a plurality of CCEs) included in the PDCCH to indicate downlink allocation control indicating resources for transmitting downlink data. Send information.
  • the base station pre-allocates two arbitrary PUCCH resources included in the PUCCH of the uplink unit band as PUCCH resources (SR resources) for SR.
  • the terminal uses two PUCCH resources respectively associated with CCEs (PDCCH) occupied by downlink allocation control information in downlink unit bands as PUCCH resources (ACK / NACK resources) for response signals.
  • PUCCH resources ACK / NACK resources
  • the terminal transmits a response signal (“A” to the downlink data (DL data) received on the downlink data channel (PDSCH) illustrated in FIG. / N ”) is allocated to two SR resources included in the PUCCH of the uplink unit band shown in FIG. Then, the terminal transmits response signals (“A / N”) assigned to the two SR resources from the two antennas, respectively.
  • the terminal transmits only a response signal within a certain subframe
  • the terminal transmits a response signal (“A / N” to the downlink data (DL data) received on the PDSCH illustrated in FIG. Is assigned to two ACK / NACK resources included in the PUCCH of the uplink unit band shown in FIG.
  • the terminal transmits response signals ("A / N") assigned to the two ACK / NACK resources from the two antennas, respectively.
  • the terminal when the terminal transmits only the SR within a certain subframe, the terminal allocates the SR to two SR resources included in the PUCCH of the uplink unit band illustrated in FIG. Then, the terminal transmits the SRs allocated to the two SR resources from the two antennas, respectively.
  • An object of the present invention is to provide a terminal apparatus and a signal transmission control method capable of suppressing an increase in uplink control channel (PUCCH) overhead even when SCTD is applied to transmission of SR and response signals. .
  • PUCCH uplink control channel
  • the terminal apparatus of the present invention allocates one of a response signal based on an error detection result of downlink data or an uplink control signal indicating the occurrence of uplink data to different code resources, and is assigned to the different code resources.
  • the response signal is assigned when the uplink control signal and the response signal occur simultaneously within a transmission unit time.
  • the response signal is assigned when only the uplink control signal is generated, and when only the uplink control signal is generated within the transmission unit time, the uplink control signal is allocated.
  • a configuration for transmitting the uplink control signal or the response signal using a third code resources are allocated.
  • either one of a response signal based on an error detection result of downlink data or an uplink control signal indicating the occurrence of uplink data is allocated to different code resources, and is allocated to the different code resources.
  • a signal transmission control method in a terminal apparatus that transmits the received response signal or uplink control signal from each of a plurality of antennas, the reception step receiving the downlink data assigned to a downlink data channel, and an error in the downlink data
  • the generation step of generating the response signal based on the detection result, the transmission step of transmitting the response signal or the uplink control signal using the different code resources, and the generation status of the response signal and the uplink control signal Based on the control signal for controlling transmission of the response signal or the uplink control signal.
  • the control step includes the uplink control signal within the transmission unit time among the first code resource, the second code resource, and the third code resource, which are the different code resources.
  • any one of the second code resources to which the response signal is assigned, the uplink control signal and the response signal within the transmission unit time Are generated at the same time and when only the response signal is generated within the transmission unit time, the response signal is assigned and the transmission unit time is within the transmission unit time.
  • the uplink control signal is allocated when only the uplink control signal is generated.
  • the present invention it is possible to suppress an increase in uplink control channel (PUCCH) overhead even when SCTD is applied to transmission of SR and response signals.
  • PUCCH uplink control channel
  • diffusion method of a response signal and a reference signal The figure which shows PUCCH in case SCTD is applied to transmission of SR and a response signal
  • the figure which shows the transmission control process of the terminal according to the generation condition of SR, and the generation condition of a response signal The block diagram which shows the structure of the base station which concerns on Embodiment 1 of this invention.
  • FIG. 4 is a block diagram showing a configuration of base station 100 according to the present embodiment.
  • the base station 100 includes a control unit 101, a control information generation unit 102, an encoding unit 103, a modulation unit 104, an encoding unit 105, a data transmission control unit 106, a modulation unit 107, Mapping unit 108, IFFT unit 109, CP adding unit 110, radio transmitting unit 111, radio receiving unit 112, CP removing unit 113, PUCCH extracting unit 114, despreading unit 115, and sequence control unit 116
  • the control unit 101 transmits a downlink resource (that is, downlink control information allocation resource) for transmitting control information and downlink data included in the control information to a resource allocation target terminal 200 to be described later.
  • a downlink resource that is, downlink control information allocation resource
  • the downlink control information allocation resource is selected in a resource corresponding to the downlink control channel (PDCCH) in the downlink unit band.
  • the downlink data allocation resource is selected in a resource corresponding to the downlink data channel (PDSCH) in the downlink unit band.
  • the control unit 101 allocates different resources to each of the resource allocation target terminals 200.
  • the downlink control information allocation resource is equivalent to the above-mentioned L1 / L2CCH. That is, the downlink control information allocation resource is composed of one or a plurality of CCEs. Further, each CCE included in the downlink control information allocation resource is associated with the configuration resource of the uplink control channel (PUCCH) on a one-to-one basis. However, the association between the CCE and the PUCCH configuration resource is made by associating the downlink unit band and the uplink unit band broadcasted for the LTE system.
  • control unit 101 determines a coding rate used when transmitting control information to the resource allocation target terminal 200. Since the data amount of control information differs according to the coding rate, downlink control information allocation resources having a number of CCEs to which control information of this data amount can be mapped are allocated by the control unit 101.
  • control part 101 outputs the information regarding a downlink data allocation resource with respect to the control information generation part 102.
  • the control unit 101 outputs information on the coding rate used when transmitting control information to the coding unit 103.
  • Control section 101 also determines the coding rate of transmission data (that is, downlink data) and outputs the coding rate to coding section 105.
  • the control unit 101 outputs information on the downlink data allocation resource and the downlink control information allocation resource to the mapping unit 108.
  • the control information generation unit 102 generates control information including downlink data allocation resources and outputs the control information to the encoding unit 103. Further, when there are a plurality of resource allocation target terminals 200, the control information includes the terminal ID of the destination terminal in order to distinguish the resource allocation target terminals 200 from each other. For example, CRC bits masked with the terminal ID of the destination terminal are included in the control information. This control information may be referred to as “downlink allocation control information”.
  • the encoding unit 103 encodes the control information input from the control information generation unit 102 according to the encoding rate received from the control unit 101, and outputs the encoded control information to the modulation unit 104.
  • Modulation section 104 modulates the encoded control information and outputs the obtained modulated signal to mapping section 108.
  • Encoding section 105 receives transmission data (that is, downlink data) for each transmission destination terminal 200 and encoding rate information from control section 101, and encodes transmission data at the encoding rate indicated by the encoding rate information. And output to the data transmission control unit 106.
  • the data transmission control unit 106 holds the encoded transmission data and outputs the encoded transmission data to the modulation unit 107 during the initial transmission.
  • the encoded transmission data is held for each transmission destination terminal 200.
  • data transmission control section 106 outputs retained data corresponding to the retransmission control signal to modulation section 107.
  • the data transmission control unit 106 deletes the retained data corresponding to the retransmission control signal. In this case, the data transmission control unit 106 outputs the next initial transmission data to the modulation unit 107.
  • Modulation section 107 modulates the encoded transmission data received from data transmission control section 106 and outputs the modulated signal to mapping section 108.
  • Mapping section 108 maps the modulation signal (downlink allocation control information) of the control information received from modulation section 104 to the resource (resource in PDCCH) indicated by the downlink control information allocation resource received from control section 101, and passes to IFFT section 109. Output.
  • mapping section 108 maps the modulation signal (downlink data) of the transmission data received from modulation section 107 to the resource (resource in PDSCH) indicated by the downlink data allocation resource received from control section 101, and to IFFT section 109. Output.
  • Control information and transmission data (downlink data) mapped to a plurality of subcarriers in the downlink unit band by mapping section 108 are converted from frequency domain signals to time domain signals by IFFT section 109, and CP adding section 110 After the CP is added to form an OFDM signal, transmission processing such as D / A conversion, amplification, and up-conversion is performed by the wireless transmission unit 111 and transmitted to the terminal 200 via the antenna.
  • the radio reception unit 112 receives an uplink control channel signal (PUCCH signal) transmitted from the terminal 200 via an antenna, and performs reception processing such as down-conversion and A / D conversion on the received signal.
  • PUCCH signal may include a response signal, SR, and a reference signal.
  • the CP removal unit 113 removes the CP added to the reception signal after the reception process.
  • the PUCCH extraction unit 114 uses SR resources, ACK / NACK resources, and resources that are commonly used during SR transmission and response signal transmission (hereinafter referred to as “common resources”).
  • the PUCCH signal corresponding to the extracted resource is extracted and assigned to each processing system corresponding to each resource.
  • code resources of SR resource ACK / NACK resource and common resource
  • two resources of ACK / NACK resource and common resource or two resources of SR resource and common resource Is used to transmit uplink control information (ie, response signal, SR, or both SR and response signal).
  • the base station 100 is provided with a processing system of a despreading unit 115 and a correlation processing unit 117 that perform processing on each of the extracted resources.
  • the despreading unit 115-1 and the correlation processing unit 117-1 are associated with the SR resource
  • the despreading unit 115-2 and the correlation processing unit 117-2 are associated with the ACK / NACK resource.
  • the despreading unit 115-3 and the correlation processing unit 117-3 are associated with the common resource.
  • despreading section 115 has a Walsh sequence (a code used for secondary spreading of the data portion) and a DFT sequence (reference signal portion) respectively corresponding to the SR resource, ACK / NACK resource or common resource from terminal 200.
  • the signal received through these resources is despread using the code used for spreading the signal, and the despread signal is output to the correlation processing unit 117.
  • Sequence control section 116 generates ZAC sequences respectively corresponding to the data part and reference signal part of the SR resource, ACK / NACK resource or common resource transmitted from terminal 200. In addition, sequence control section 116 specifies a correlation window from which a signal is to be extracted in association with these resources. Then, sequence control unit 116 outputs information indicating the identified correlation window and the generated ZAC sequence to correlation processing unit 117.
  • the correlation processing unit 117 uses the information indicating the correlation window input from the sequence control unit 116 and the ZAC sequence to obtain the correlation value between the despread signal and the ZAC sequence in the data portion (ie, as shown in FIG. 1). S 0 to S 3 ) and the reference signal portion (that is, R 0 to R 2 shown in FIG. 1) are obtained separately. Then, the correlation processing unit 117 outputs information regarding the obtained correlation value to the determination unit 118.
  • the determination unit 118 determines whether the SR and the response signal are transmitted from the terminal based on the correlation value input from the correlation processing unit 117. That is, the determination unit 118 determines which one of the SR resource and common resource pair or the ACK / NACK resource and common resource pair is used by the terminal 200.
  • the determination unit 118 determines that the terminal 200 is using the combination of the SR resource and the common resource at the timing at which the terminal should transmit a response signal to the downlink data
  • the terminal 200 receives the SR and It is determined that both response signals are transmitted.
  • the determining unit 118 starts from the terminal 200. Determines that only SR is being transmitted.
  • the determination unit 118 determines that the terminal 200 uses a set of ACK / NACK resources and common resources, the determination unit 118 determines that only the response signal is transmitted from the terminal 200. Further, when the determination unit 118 determines that no resource is used by the terminal, the determination unit 118 determines that neither SR nor a response signal is transmitted from the terminal 200.
  • the determining unit 118 when determining that the terminal 200 is transmitting SR, the determining unit 118 outputs information about the SR to an uplink resource allocation control unit (not shown). When determining that the terminal 200 is transmitting a response signal, the determining unit 118 further determines, for example, by synchronous detection whether the response signal indicates ACK or NACK. Then, determination section 118 outputs a determination result (ACK or NACK) for each terminal to retransmission control signal generation section 119. In addition, when determining that terminal 200 has not transmitted a response signal, determining section 118 outputs DTX information to retransmission control signal generating section 119.
  • the base station 100 transmits the uplink allocation control information for reporting the uplink data allocation resource to the terminal so that the terminal 200 can transmit the uplink data. 200. In this way, base station 100 determines whether it is necessary to allocate resources for uplink data to terminal 200 based on the uplink control channel. Details of operations in the uplink resource allocation control unit and details of resource allocation operations for uplink data for terminal 200 in base station 100 are omitted.
  • retransmission control signal generation section 119 should retransmit the data (downlink data) transmitted in the downlink unit band based on the determination result (ACK or NACK) or the DTX information related to the response signal input from determination section 118 And a retransmission control signal is generated based on the determination result.
  • retransmission control signal generation section 119 when receiving a response signal indicating DACK or DTX, retransmission control signal generation section 119 generates a retransmission control signal indicating a retransmission command and outputs the retransmission control signal to data transmission control section 106.
  • retransmission control signal generation section 119 When receiving a response signal indicating ACK, retransmission control signal generation section 119 generates a retransmission control signal indicating that retransmission is not performed, and outputs the retransmission control signal to data transmission control section 106.
  • FIG. 5 is a block diagram showing a configuration of terminal 200 according to the present embodiment.
  • a terminal 200 includes a radio reception unit 201, a CP removal unit 202, an FFT unit 203, an extraction unit 204, a demodulation unit 205, a decoding unit 206, a determination unit 207, a control unit 208, It has a demodulation unit 209, a decoding unit 210, a CRC unit 211, a response signal generation unit 212, an uplink control channel signal generation unit 213, and a radio transmission unit 214.
  • 5 has two antennas 1 and 2.
  • the radio reception unit 201 receives the OFDM signal transmitted from the base station 100 via the antennas 1 and 2 and performs reception processing such as down-conversion and A / D conversion on the received OFDM signal.
  • the received OFDM signal includes a PDSCH signal (downlink data) assigned to a resource in PDSCH or a PDCCH signal (downlink assignment control information) assigned to a resource in PDCCH.
  • CP removing section 202 removes the CP added to the OFDM signal after reception processing.
  • the FFT unit 203 performs FFT on the received OFDM signal and converts it into a frequency domain signal, and outputs the obtained received signal to the extracting unit 204.
  • the extraction unit 204 extracts a downlink control channel signal (PDCCH signal) from the received signal received from the FFT unit 203 according to the input coding rate information. That is, since the number of CCEs constituting the downlink control information allocation resource changes according to the coding rate, the extraction unit 204 extracts the downlink control channel signal using the number of CCEs corresponding to the coding rate as an extraction unit. .
  • the extracted downlink control channel signal is output to demodulation section 205.
  • the extraction unit 204 extracts downlink data (downlink data channel signal (PDSCH signal)) from the received signal based on the information on the downlink data allocation resource addressed to the own device received from the determination unit 207, and sends it to the demodulation unit 209. Output.
  • PDSCH signal downlink data channel signal
  • the demodulation unit 205 demodulates the downlink control channel signal received from the extraction unit 204 and outputs the obtained demodulation result to the decoding unit 206.
  • the decoding unit 206 decodes the demodulation result received from the demodulation unit 205 according to the input coding rate information, and outputs the obtained decoding result to the determination unit 207.
  • the determination unit 207 identifies the CCE to which the control information addressed to itself is mapped, and outputs the identified CCE identification information to the control unit 208.
  • the control unit 208 identifies the PUCCH resource (frequency / code) corresponding to the CCE indicated by the CCE identification information received from the determination unit 207 as an ACK / NACK resource. Then, the control unit 208 transmits the ZAC sequence and the cyclic shift amount respectively corresponding to the identified ACK / NACK resource, the SR resource and the common resource previously notified from the base station 100, to the uplink control channel signal generation unit 213. Output to spreading section 222 and output frequency resource information to IFFT section 223.
  • control unit 208 outputs the ZAC sequence and frequency resource information as the reference signal to the IFFT unit 226, outputs the Walsh sequence to be used for the second spreading of the response signal to the spreading unit 225, and performs the second spreading of the reference signal.
  • the DFT sequence to be used for the transmission is output to the spreading unit 228.
  • control unit 208 outputs the above information (ZAC sequence, cyclic shift amount, frequency resource information, Walsh sequence, and DFT sequence) corresponding to the common resource to the uplink control channel signal generation unit 213-2. Further, when the control unit 208 receives an SR from an uplink data generation unit (not shown), the control unit 208 receives the above information (ZAC sequence, cyclic shift amount, frequency resource information, Walsh sequence, and DFT sequence) corresponding to the SR resource. Output to uplink control channel signal generator 213-1.
  • control unit 208 does not receive an SR from an uplink data generation unit (not shown), the control unit 208 does not receive the above information corresponding to the ACK / NACK resource (ZAC sequence, cyclic shift amount, frequency resource information, Walsh sequence, and DFT sequence) is output to uplink control channel signal generation section 213-1.
  • ZAC sequence, cyclic shift amount, frequency resource information, Walsh sequence, and DFT sequence is output to uplink control channel signal generation section 213-1.
  • control unit 208 when there is no response signal to be transmitted in the subframe that has received the SR (that is, when no downlink allocation control information is detected), the control unit 208 notifies the response signal generation unit 212 of “NACK Is output to the uplink control channel signal generation unit 213. That is, the control unit 208 controls the transmission of the response signal or SR based on the response signal and the state of occurrence of SR. Details of SR and response signal transmission control in control unit 208 will be described later.
  • Demodulation section 209 demodulates the downlink data received from extraction section 204, and outputs the demodulated downlink data to decoding section 210.
  • Decoding section 210 decodes the downlink data received from demodulation section 209 and outputs the decoded downlink data to CRC section 211.
  • the response signal generation unit 212 generates a response signal to be transmitted to the base station 100 based on the downlink data reception status (downlink data error detection result) input from the CRC unit 211. However, the response signal generation unit 212 generates a NACK when there is an instruction from the control unit 208 (that is, when the terminal 200 transmits only SR). Then, the response signal generation unit 212 outputs the generated “response signal or NACK” (hereinafter simply referred to as “response signal”) to the uplink control channel signal generation units 213-1 and 213-2.
  • the uplink control channel signal generation unit 213 generates an uplink control channel signal (PUCCH signal) based on the response signal received from the response signal generation unit 212.
  • Terminal 200 is provided with uplink control channel signal generation sections 213-1 and 213-2 corresponding to antenna 1 and antenna 2 of terminal 200, respectively. Further, uplink control channel signal generation section 213-1 corresponds to SR resources or ACK / NACK resources in PUCCH, and uplink control channel signal generation section 213-2 corresponds to common resources in PUCCH.
  • the uplink control channel signal generation unit 213 includes a modulation unit 221, a spreading unit 222, an IFFT unit 223, a CP adding unit 224, a spreading unit 225, an IFFT unit 226, and a CP adding unit 227. , A diffusion unit 228 and a multiplexing unit 229.
  • the modulation unit 221 modulates the response signal input from the response signal generation unit 212 and outputs it to the spreading unit 222.
  • the spreading unit 222 performs first spreading of the response signal based on the ZAC sequence and the cyclic shift amount set by the control unit 208, and outputs the response signal after the first spreading to the IFFT unit 223. That is, spreading section 222 performs first spreading of the response signal in accordance with an instruction from control section 208. In other words, the spreading unit 222 multiplies each component of the ZAC sequence specified by the control unit 208 by a response signal component represented by a complex number.
  • the IFFT unit 223 arranges the response signal after the first spreading on the frequency axis based on the frequency resource information input from the control unit 208, and performs IFFT. Then, IFFT section 223 outputs the response signal after IFFT to CP adding section 224.
  • the CP adding unit 224 adds the same signal as the tail part of the response signal after IFFT to the head of the response signal as a CP.
  • Spreading section 225 uses the Walsh sequence set by control section 208 to secondarily spread the response signal after CP addition, and outputs the response signal after the second spreading to multiplexing section 229. That is, spreading section 225 performs second spreading on the response signal after the first spreading using a Walsh sequence corresponding to the resource selected by control section 208. That is, spreading section 225 multiplies the response signal after the first spreading by a Walsh sequence component.
  • the IFFT unit 226 arranges the reference signal on the frequency axis based on the frequency resource information input from the control unit 208, and performs IFFT. Then, IFFT unit 226 outputs the reference signal after IFFT to CP adding unit 227.
  • the CP adding unit 227 adds the same signal as the tail part of the reference signal after IFFT to the head of the reference signal as a CP.
  • Spreading section 228 spreads the reference signal after adding the CP with the DFT sequence instructed from control section 208 and outputs the spread reference signal to multiplexing section 229.
  • the multiplexing unit 229 time-multiplexes the response signal after second spreading and the reference signal after spreading into one slot, and outputs the result to the radio transmitting unit 214 corresponding to each of the antennas 1 and 2.
  • the radio transmission unit 214 performs transmission processing such as D / A conversion, amplification, and up-conversion on the signal received from the multiplexing unit 229 of the uplink control channel signal generation unit 213, and transmits the signal from the antenna to the base station 100.
  • Terminal 200 is provided with radio transmission sections 214-1 and 214-2 corresponding to antenna 1 and antenna 2 of terminal 200, respectively. That is, radio transmission section 214-1 transmits a response signal or SR using SR resources or ACK / NACK resources, and radio transmission section 214-2 is a common resource different from SR resources (and ACK / NACK resources). Is used to transmit a response signal or SR.
  • base station 100 transmits SR to terminal 200 in the uplink unit band shown in FIG. 2 (uplink unit band set in terminal 200).
  • Information about the resource (SR resource shown in FIG. 6A) and information about the resource (common resource shown in FIG. 6A) used in common for both SR transmission and response signal transmission are notified in advance one by one. . That is, the control unit 208 of the terminal 200 holds information regarding the SR resource and information regarding the common resource notified from the base station 100.
  • ACK / NACK resources (FIG. 2) associated with CCEs occupied by downlink assignment control information received by the own device. 6A) is specified.
  • the SR resource, the ACK / NACK resource, and the common resource are different code resources in which at least one of the ZAC sequence (primary spreading) or the orthogonal code sequence is different.
  • the terminal according to the SR occurrence status in a certain subframe and the response signal occurrence status (that is, the downlink allocation control information detection status in terminal 200)
  • a detailed operation of the transmission control process 200 (control unit 208) will be described with reference to FIGS. 6B to 6D.
  • control section 208 outputs information (cyclic shift amount, ZAC sequence, frequency resource information, Walsh sequence, DFT sequence) corresponding to the SR resource to uplink control channel signal generation section 213-1. To do. Also, the control unit 208 outputs information (cyclic shift amount, ZAC sequence, frequency resource information, Walsh sequence, DFT sequence) corresponding to the common resource to the uplink control channel signal generation unit 213-2.
  • control unit 208 instructs the response signal generation unit 212 to output the response signal input from the CRC unit 211 to the uplink control channel signal generation units 213-1 and 213-2.
  • the terminal 200 uses the SR resource and the common resource, as shown in FIG. 6B, to respond to the downlink data (“A / N "). Specifically, terminal 200 transmits the same response signal from antenna 1 using the SR resource, and transmits from antenna 2 using the common resource. That is, terminal 200 transmits the same response signals respectively assigned to SR resources and common resources, which are different code resources, from two antennas 1 and 2, respectively.
  • the determination unit 118 of the base station 100 determines that the terminal 200 has transmitted the SR because the SR resource and the common resource are used in the PUCCH of the uplink unit band illustrated in FIG. 6B. Furthermore, base station 100 determines whether terminal 200 has transmitted ACK or NACK as a response signal based on the phase of the signal received by the SR resource and the common resource (that is, based on the demodulation result by BPSK). To do.
  • control section 208 provides information corresponding to the ACK / NACK resource to uplink control channel signal generation section 213-1 (cyclic shift amount, ZAC sequence, frequency resource information, Walsh sequence, DFT sequence). Is output. Also, the control unit 208 outputs information (cyclic shift amount, ZAC sequence, frequency resource information, Walsh sequence, DFT sequence) corresponding to the common resource to the uplink control channel signal generation unit 213-2.
  • control unit 208 instructs the response signal generation unit 212 to output the response signal input from the CRC unit 211 to the uplink control channel signal generation units 213-1 and 213-2.
  • terminal 200 uses the ACK / NACK resource and the common resource as shown in FIG. 6C to respond to the downlink data (“A / N )). Specifically, terminal 200 transmits the same response signal from antenna 1 using ACK / NACK resources and transmits from antenna 2 using common resources. That is, terminal 200 transmits the same response signals respectively assigned to ACK / NACK resources and common resources, which are different code resources, from two antennas 1 and 2, respectively.
  • the determination part 118 of the base station 100 determines with the terminal 200 having transmitted the response signal from the ACK / NACK resource and the common resource being used in PUCCH of the uplink unit band shown in FIG. 6C. Also, base station 100 determines that terminal 200 has transmitted ACK or NACK as a response signal based on the phase of the response signal received using the ACK / NACK resource and the common resource.
  • control section 208 outputs information (cyclic shift amount, ZAC sequence, frequency resource information, Walsh sequence, DFT sequence) corresponding to the SR resource to uplink control channel signal generation section 213-1. To do. Also, the control unit 208 outputs information (cyclic shift amount, ZAC sequence, frequency resource information, Walsh sequence, DFT sequence) corresponding to the common resource to the uplink control channel signal generation unit 213-2.
  • control unit 208 instructs the response signal generation unit 212 to output “NACK” to the uplink control channel signal generation units 213-1 and 213-2.
  • terminal 200 transmits SR having the same phase point as “NACK” using SR resources and common resources, as shown in FIG. 6D. . That is, terminal 200 transmits NACK using the SR resource and shared resource shown in FIG. 6D. Specifically, terminal 200 transmits the same SR (NACK) from antenna 1 using the SR resource, and transmits from antenna 2 using the common resource. That is, terminal 200 transmits the same SR (NACK) respectively assigned to SR resources and common resources, which are different code resources, using two antennas 1 and 2, respectively.
  • terminal 200 shown in FIG. 6D (that is, the operation in which terminal 200 transmits only SR) is when downlink data is not allocated to terminal 200 and only SR occurs in terminal 200. Two situations are assumed when SR occurs when terminal 200 fails to receive downlink allocation control information for the terminal 200.
  • the base station 100 uses the SR resource and the common resource in the uplink unit band PUCCH shown in FIG. 6D, and when receiving the SR transmitted at the same phase point as the NACK, the base station 100
  • the received SR is SR + NACK (that is, uplink data allocation request + retransmission request) depending on whether downlink data has been allocated to terminal 200 (whether downlink allocation control information has been transmitted). Or only SR (that is, only uplink data allocation request) is determined. If base station 100 determines that the received SR is SR + NACK (that is, uplink data allocation request + retransmission request), not only resource allocation processing for uplink data but also downlink data Performs retransmission processing.
  • the base station 100 can perform optimum retransmission control according to the allocation status by the own station.
  • terminal 200 does not transmit the SR and response signal in the PUCCH resource.
  • the control unit 208 of the terminal 200 when SR and a response signal are simultaneously generated in a certain subframe among SR resources, ACK / NACK resources, and common resources which are different code resources (FIG. 6B).
  • Is assigned a response signal and only SR is generated in a certain subframe (FIG. 6D), or “SR resource” to which SR is assigned, or only a response signal is generated in a certain subframe (FIG. 6C).
  • SR resource to which SR is assigned, or only a response signal is generated in a certain subframe
  • the control unit 208 of the terminal 200 uses the common resource shown in FIG. 6A as an SR resource or an ACK / NACK resource according to the SR occurrence status and the response signal occurrence status.
  • the control unit 208 uses the common resource as the SR resource, whereas when the SR does not occur as shown in FIG. 6C, the control unit 208 uses the common resource.
  • ACK / NACK resources are used as ACK / NACK resources.
  • the control unit 208 allocates a response signal (“A / N”) to the common resource, and no response signal is generated as shown in FIG. 6D.
  • SR NACK
  • the terminal 200 transmits both SR and the response signal simultaneously in a certain subframe (FIG. 6B), and transmits only SR within a certain subframe (FIG. 6D)
  • the terminal 200 Using the common resource, the same signal (the same response signal in FIG. 6B and the same SR (NACK) in FIG. 6D) is transmitted using two antennas.
  • terminal 200 transmits the same response signal using two antennas using ACK / NACK resources and common resources.
  • terminal 200 always uses a common resource regardless of whether both SR and the response signal are transmitted at the same time or only one of the SR and the response signal is transmitted independently within a certain subframe. That is, terminal 200 includes, among three different code resources (SR resource, ACK / NACK resource, and common resource shown in FIG. 6A), one of the SR resource or the ACK / NACK resource, the common resource, Is used to transmit an SR or a response signal. Thereby, even when SCTD is applied to the transmission of the SR and the response signal, in terminal 200, one of the two different code resources corresponding to the two antennas (common resource) is designated as the SR resource. Shared with ACK / NACK resources. For this reason, in the uplink unit band PUCCH, an increase in the amount of resources used for transmission of SR and response signals can be suppressed.
  • SR resource ACK / NACK resource, and common resource shown in FIG. 6A
  • FIG. 2 described above is compared with FIG. 6A according to the present embodiment.
  • base station 100 when SCTD is applied to transmission of SR and response signals, it is necessary to prepare two resources, that is, a total of four resources, as SR resources and ACK / NACK resources, respectively.
  • base station 100 notifies terminal 200 of the common resource in advance, so that SR resource, ACK / NACK resource, and common resource (SR and response signal) In other words, only a total of three resources (resources used in common) may be prepared. That is, in the uplink unit band PUCCH, an increase in the amount of resources necessary for transmission of the SR and the response signal can be suppressed.
  • half of two resources are always used in four sub-frames (two SR resources and two ACK / NACK resources).
  • one resource (SR resource or ACK / NACK resource) out of three resources (SR resource, common resource, and ACK / NACK resource). ) Is not always used. That is, by suppressing an increase in the amount of resources that are not used in PUCCH and are wasted, it is possible to suppress a decrease in resource utilization efficiency.
  • the present embodiment it is possible to suppress an increase in the overhead of the uplink control channel (PUCCH) even when SCTD is applied to the transmission of the SR and the response signal.
  • PUCCH uplink control channel
  • Embodiment 2 Based on the likelihood after synchronous detection as one of the determination methods on the base station side to determine which of the SR resource and common resource set or the ACK / NACK resource and common resource set is used by the terminal There is a determination method (likelihood determination). Specifically, the base station first performs synchronous detection on signals allocated to different code resources (for example, the SR resource, the ACK / NACK resource, and the common resource in Embodiment 1), respectively. Next, the base station uses, for example, Maximum Ratio Combining (MRC equalization) or the like for each signal of the SR resource and common resource set and the ACK / NACK resource and common resource set. To synthesize.
  • MRC equalization Maximum Ratio Combining
  • the base station calculates a likelihood indicating how close the combined result of each set is to the signal point of the response signal. For example, as shown in FIG. 7, the base station obtains the Euclidean distance between the combination result of each set and the signal point of the closest response signal (phase point ( ⁇ 1, 0) in FIG. 7), and the reciprocal of the Euclidean distance. Is calculated as a likelihood. Then, the base station determines that the code resource of the group with the higher likelihood (that is, the group with the shorter Euclidean distance) is the code resource used by the terminal. In FIG. 7, the set of the ACK / NACK resource and the common resource has a higher likelihood (the Euclidean distance is shorter) than the set of the SR resource and the common resource. Therefore, in FIG. 7, the base station determines that a set of ACK / NACK resources and common resources is used by the terminal.
  • ACK is associated with the phase point ( ⁇ 1, 0)
  • NACK is associated with the phase point (1, 0).
  • the signal component (white circle shown in FIG. 8) is the ACK phase point ( ⁇ 1, 0) (black circle shown in FIG. 8). Appears nearby. Although nothing is assigned to the ACK / NACK resource in the terminal, a noise component appears in the ACK / NACK resource in the base station as shown in FIG. 8B. In general, the noise component appears at a position away from the ACK phase point (-1, 0) (black circle shown in FIG. 8).
  • the base station firstly, as shown in FIG. 8A, the signal component assigned to the SR resource (in the vicinity of the phase point ( ⁇ 1, 0) in FIG. 8A) and the signal component assigned to the common resource (FIG. 8A). Then, the phase point (around -1, 0)) is synthesized. As a result, as shown in FIG. 8A, a signal near the phase point ( ⁇ 1, 0) is obtained as a synthesis result.
  • the base station combines the noise component present in the ACK / NACK resource and the signal component assigned to the common resource (in the vicinity of the phase point ( ⁇ 1, 0) in FIG. 8B). Synthesize. As a result, as shown in FIG. 8B, a signal near the phase point ( ⁇ 1, 0) is obtained as a synthesis result.
  • the base station calculates the likelihood calculated using the Euclidean distance between the combined result shown in FIG. 8A and the closest ACK (phase point ( ⁇ 1, 0)), and the combined result shown in FIG.
  • the likelihood calculated using the Euclidean distance of the close ACK (phase point ( ⁇ 1, 0)) is compared.
  • the noise component is likely to appear at a position away from the ACK phase point ( ⁇ 1, 0) (black circle shown in FIG. 8), so that as shown in FIGS. 8A and 8B, The Euclidean distance between the synthesis result shown in FIG. 8B and the ACK phase point is likely to be longer than the Euclidean distance between the synthesis result shown in FIG. 8A and the ACK phase point.
  • the base station has a higher likelihood of the SR resource and common resource pair shown in FIG. 8A than the ACK / NACK resource and common resource pair shown in FIG. 8B (because the Euclidean distance is short). Thus, it can be determined that the combination of the SR resource and the common resource is used. Further, the base station can determine that the response signal is ACK because the combination result of the combination of the SR resource and the common resource is the phase point ( ⁇ 1, 0).
  • the terminal assigns a signal allocated to the common resource when the SR resource and the common resource are used (when SR occurs). And the amount of phase rotation differ between the ACK / NACK resource and the signal allocated to the common resource when the common resource is used (when SR does not occur).
  • FIG. 9 shows the configuration of base station 300 according to the present embodiment.
  • the same components as those of base station 100 shown in FIG. 4 (Embodiment 1) are denoted by the same reference numerals, and description thereof is omitted.
  • correlation processing section 117-3 corresponding to the common resource obtains information on correlation values (data part and reference signal part) between the signal after despreading and the ZAC sequence, by determining part 318. And output to the phase rotation unit 301.
  • the phase rotation unit 301 only applies a preset angle (eg, ⁇ 90 degrees) only to the data portion of the signal input from the correlation processing unit 117-3 (ie, S 0 to S 3 shown in FIG. 1). Rotate the phase (ie, multiply the data part by exp ( ⁇ j ⁇ / 2)). Note that the angle set in advance in the phase rotation unit 301 is opposite to the angle (90 degrees) set in advance in the phase rotation unit 401 (FIG. 10) of the terminal 400, which will be described later, and has the same size. . Note that the phase rotation unit 301 does not rotate the phase of the reference signal portion (that is, R 0 to R 2 shown in FIG. 1) of the signal input from the correlation processing unit 117-3. Then, phase rotation section 301 outputs a signal obtained by rotating the phase of the data portion (a signal obtained by multiplying the data portion by exp ( ⁇ j ⁇ / 2)) to determination section 318.
  • a preset angle eg, ⁇ 90 degrees
  • the determination unit 318 determines whether the SR and the response signal are transmitted from the terminal based on the signals (correlation values) input from the correlation processing units 117-1 to 117-3 and the phase rotation unit 301. That is, the determination unit 318 determines which of the SR resource and the common resource set or the ACK / NACK resource and the common resource set is used by the terminal 400.
  • the determination unit 318 receives the signal input from the correlation processing unit 117-1 (correlation value corresponding to the SR resource) and the signal input from the phase rotation unit 301 (correlation value corresponding to the common resource (the phase of the data portion)). For example) using MRC or the like. Similarly, the determination unit 318 receives the signal input from the correlation processing unit 117-2 (correlation value corresponding to the ACK / NACK resource) and the signal input from the correlation processing unit 117-3 (correlation corresponding to the common resource). The value (without phase rotation of the data portion) is synthesized using, for example, MRC.
  • the determination unit 318 includes a combination result of the SR resource and the common resource, and a combination result of the combination of the ACK / NACK resource and the common resource, and a signal point of the response signal closest to each combination result. Find the Euclidean distance between. Further, the determination unit 318 calculates the likelihood (likelihood) indicating how close the combined result of each set is with the signal point of the response signal using the obtained Euclidean distance of each set. For example, the determination unit 318 uses the reciprocal of each set of Euclidean distances as the likelihood of each set. That is, the likelihood becomes larger as the Euclidean distance is shorter.
  • the determination unit 318 compares the likelihoods of the respective groups, and determines that the group having the higher likelihood is a group used by the terminal 400. Specifically, when the likelihood of the SR resource and common resource pair is greater than that of the ACK / NACK resource and common resource pair (when the Euclidean distance from the signal point of the response signal is shorter), the determination unit 318 determines that the terminal 400 is using a set of SR resources and common resources. In this case, determination section 318 outputs SR to an uplink resource allocation control section (not shown) in order to determine that SR is transmitted from terminal 400.
  • the determination unit 318 determines that a set of ACK / NACK resources and common resources is used. In this case, since determination section 318 determines that SR has not been transmitted from terminal 400, it does not output SR to an uplink resource allocation control section (not shown).
  • FIG. 10 shows the configuration of terminal 400 according to the present embodiment. 10, the same components as those of terminal 200 shown in FIG. 5 (Embodiment 1) are denoted by the same reference numerals, and description thereof is omitted.
  • control unit 408 when receiving a SR from an uplink data generation unit (not shown), control unit 408 receives information (ZAC sequence, The cyclic shift amount, the frequency resource information, the Walsh sequence, and the DFT sequence) are output to the uplink control channel signal generation unit 213-1, and the phase of the signal is set to the phase rotation unit 401 by a preset angle (for example, 90 (In degrees) is output (the signal is multiplied by exp (j ⁇ / 2)).
  • a preset angle for example, 90 (In degrees) is output (the signal is multiplied by exp (j ⁇ / 2)
  • the control unit 408 does not receive the SR from the uplink data generation unit (not shown)
  • the information corresponding to the ACK / NACK resource (ZAC sequence, cyclic shift amount, frequency resource information, Walsh sequence, and DFT) Sequence) is output to the uplink control channel signal generation unit 213-1 and an instruction signal that does not rotate the phase of the signal is output to the phase rotation unit 401.
  • the response signal generation unit 212 outputs the generated response signal or NACK (when there is an instruction from the control unit 408) to the modulation unit 221 and the phase rotation unit 401 of the uplink control channel signal generation unit 213-1.
  • the phase rotation unit 401 determines whether to rotate the phase of the signal input from the response signal generation unit 212 according to the instruction signal from the control unit 408. Specifically, when an instruction signal for rotating the phase of the signal is input from the control unit 408, the phase rotation unit 401 rotates the phase of the signal by 90 degrees (multiply the signal by exp (j ⁇ / 2). To do). On the other hand, when an instruction signal that does not rotate the phase of the signal is input from the control unit 408, the phase rotation unit 401 does not rotate the phase of the signal (does not multiply the signal by exp (j ⁇ / 2)). Then, the phase rotation unit 401 uses the signal after phase rotation processing corresponding to the instruction signal (that is, the signal with phase rotation or the signal without phase rotation) as an uplink control channel signal generation unit 213-2 corresponding to the common resource. To the modulation unit 221.
  • base station 300 transmits, to terminal 400, the uplink unit band (uplink unit set in terminal 400) shown in FIG. In the band), information on SR resources and information on common resources are notified in advance one by one. That is, the control unit 408 of the terminal 400 holds information regarding the SR resource and information regarding the common resource notified from the base station 300.
  • terminal 400 identifies an ACK / NACK resource (FIG. 6A) associated with the CCE occupied by the downlink allocation control information received by itself.
  • angles set in advance in the phase rotation unit 301 and the phase rotation unit 401 are set to ⁇ 90 degrees and 90 degrees, respectively.
  • values that are preset in the phase rotation unit 301 and the phase rotation unit 401 and are multiplied by the signal are expressed as exp ( ⁇ j ⁇ / 2) and exp (j ⁇ / 2), respectively.
  • ACK is associated with the phase point (-1, 0)
  • NACK is associated with the phase point (1, 0).
  • terminal 400 transmits a response signal (“A / N”) for downlink data using the SR resource and the common resource, as in Embodiment 1 (FIG. 6B).
  • the control unit 408 of the terminal 400 controls to transmit the same response signal from the antenna 1 using the SR resource and to transmit from the antenna 2 using the common resource.
  • control unit 408 instructs the response signal generation unit 212 to output the response signal input from the CRC unit 211 to the modulation unit 221 and the phase rotation unit 401 of the uplink control channel signal generation unit 213-1. To do.
  • the control unit 408 also causes the phase rotation unit 401 to rotate the response signal input from the response signal generation unit 212 by 90 degrees (multiply the response signal by exp (j ⁇ / 2). ) Output the instruction signal.
  • phase rotation unit 401 rotates the phase of the response signal input from the response signal generation unit 212 by 90 degrees (that is, the response signal is multiplied by exp (j ⁇ / 2)).
  • the response signal (“A / N”) is used in the SR resource.
  • the response signal (“A / N”) is used in the SR resource.
  • NACK is associated with the phase point (1, 0).
  • the common resource ACK is associated with the phase point (0, ⁇ j)
  • NACK is the phase point as the signal point arrangement of the response signal (“A / N”).
  • terminal 400 uses the constellation of response signal allocated to the common resource for the constellation of response signal allocated to the SR resource. Rotate the rotation 90 degrees.
  • the constellation of the response signal allocated to the SR resource is different from the constellation of the response signal allocated to the common resource by 90 degrees.
  • the terminal 400 rotates only the phase of the response signal in the phase rotation unit 401 and does not rotate the phase of the reference signal (RS in FIG. 11). Therefore, as shown in FIG. 11, the reference signal (RS) transmitted by the SR resource and the common resource is associated with the same phase point (1, 0).
  • terminal 400 transmits a response signal (“A / N”) for downlink data using ACK / NACK resources and common resources, as in Embodiment 1 (FIG. 6C).
  • the control unit 408 of the terminal 400 controls to transmit the same response signal from the antenna 1 using ACK / NACK resources and to transmit from the antenna 2 using common resources.
  • control unit 408 instructs the response signal generation unit 212 to output the response signal input from the CRC unit 211 to the modulation unit 221 and the phase rotation unit 401 of the uplink control channel signal generation unit 213-1. To do.
  • control unit 408 instructs the phase rotation unit 401 not to rotate the phase of the response signal input from the response signal generation unit 212 (do not multiply the response signal by exp (j ⁇ / 2)). Output a signal.
  • the phase rotation unit 401 outputs the response signal input from the response signal generation unit 212 as it is to the modulation unit 221 of the uplink control channel signal generation unit 213-2 without rotating the phase.
  • the response signal (“A / N”) is transmitted in the ACK / NACK resource.
  • ACK is associated with the phase point (-1, 0) and NACK is associated with the phase point (1, 0).
  • NACK is associated with the phase point (1, 0) as the signal point arrangement of the response signal (“A / N”).
  • the constellation of the response signal allocated to the ACK / NACK resource is the same as the constellation of the response signal allocated to the common resource.
  • terminal 400 transmits SR using the same phase point as “NACK” using the SR resource and the common resource, as in Embodiment 1 (FIG. 6D). Specifically, the control unit 408 of the terminal 400 controls to transmit the same SR (NACK) from the antenna 1 using the SR resource and to transmit from the antenna 2 using the common resource.
  • control unit 408 instructs the response signal generation unit 212 to output “NACK” to the modulation unit 221 and the phase rotation unit 401 of the uplink control channel signal generation unit 213-1.
  • control unit 408 sets exp (j ⁇ / 2) to the signal (NACK) so that the phase of the signal (NACK) input from the response signal generation unit 212 is rotated by 90 degrees with respect to the phase rotation unit 401.
  • Output instruction signal (to multiply).
  • phase rotation unit 401 rotates the phase of the signal (NACK) input from the response signal generation unit 212 by 90 degrees (that is, the signal (NACK) is multiplied by exp (j ⁇ / 2)).
  • the signal (NACK) corresponds to the phase point (1, 0) in SR resource. Attached.
  • the signal (NACK) is associated with the phase point (0, j). That is, when only SR occurs in a certain subframe, terminal 400 constellation of SR (NACK) allocated to the common resource, in contrast to the constellation of SR (NACK) allocated to the SR resource. Rotate 90 degrees. Thereby, the constellation of SR (NACK) allocated to the SR resource differs from the constellation of SR (NACK) allocated to the common resource by 90 degrees.
  • terminal 400 rotates the phase of only the signal (NACK) in phase rotation unit 401 and rotates the phase of the reference signal (RS in FIG. 11) in the same manner as when transmitting the SR + response signal shown in FIG. Absent. Therefore, as shown in FIG. 11, the reference signal (RS) transmitted by the SR resource and the common resource is associated with the same phase point (1, 0).
  • terminal 400 does not transmit the SR and response signal in the PUCCH resource.
  • the signal component assigned to the SR resource (white circle in SR resource shown in FIG. 12A) is the ACK phase point ( ⁇ 1, 0) (in the SR resource shown in FIG. 12A).
  • Near the ACK phase point (0, -j) black circle in the common resource shown in FIG. 12A
  • the signal component assigned to the common resource (white circle in the common resource shown in FIG. 12A).
  • a noise component appears in the ACK / NACK resource. In general, the noise component appears at a position away from the ACK phase point ( ⁇ 1, 0) (black circle in the ACK / NACK resource shown in FIG. 12B).
  • the phase rotation unit 301 of the base station 300 obtains the likelihood for the combination of the SR resource and the common resource, as shown in FIG. 12A, the signal component obtained from the common resource (the phase of the ACK in the common resource in FIG. 12A).
  • the phase of the point (near 0, -j)) is rotated by -90 degrees (the data portion of the correlation value is multiplied by exp (-j ⁇ / 2)).
  • the signal component is near the phase point ( ⁇ 1, 0) after the phase rotation.
  • the determination unit 318 first includes a signal component assigned to the SR resource (near the phase point ( ⁇ 1, 0) in FIG. 12A) and a signal component input from the phase rotation unit 301. (In other words, the signal component assigned to the common resource is rotated by ⁇ 90 degrees (the result obtained by multiplying the signal component by exp ( ⁇ j ⁇ / 2))). As a result, as shown in FIG. 12A, a signal near the phase point ( ⁇ 1, 0) is obtained as a synthesis result.
  • the determination unit 318 when determining the likelihood for a set of ACK / NACK resources and common resources, includes a component (noise component in FIG. 12B) present in the ACK / NACK resource, as shown in FIG.
  • the signal components allocated to the common resource are combined.
  • a signal near the phase point (0, ⁇ j) is obtained as a synthesis result.
  • the determining unit 318 calculates the likelihood calculated using the Euclidean distance between the combined signal component (combined result) and ACK (phase point ( ⁇ 1, 0)) shown in FIG. Are compared with the likelihood calculated using the Euclidean distance of ACK (phase point ( ⁇ 1, 0)). Therefore, the determination unit 318 has a higher likelihood of the SR resource and common resource pair illustrated in FIG. 12A than the ACK / NACK resource and common resource pair illustrated in FIG. 12B (since the Euclidean distance is short), The terminal 400 determines that a set of SR resources and common resources is used. Further, the determination unit 318 determines that the response signal is ACK because the combination result of the combination of the SR resource and the common resource is near the phase point ( ⁇ 1, 0).
  • terminal 400 responds to a constellation of signals allocated to SR resources when SR and a response signal are generated simultaneously in a certain subframe and when only SR is generated in a certain subframe.
  • Rotate the constellation of the signal allocated to the common resource by 90 degrees multiply the signal by exp (j ⁇ / 2)). That is, as shown in FIG. 11, terminal 400 constellation of signals allocated to SR resources when SR and a response signal occur simultaneously in a certain subframe and when only SR occurs in a certain subframe. And the constellation of signals allocated to common resources are different.
  • terminal 400 has the same constellation of signals allocated to ACK / NACK resources and constellation of signals allocated to common resources when only a response signal is generated in a certain subframe. To.
  • the phase rotation amount is changed.
  • terminal 400 can take a phase point that can be taken by a signal assigned to an SR resource when SR and a response signal occur simultaneously in a subframe and when only SR occurs in a subframe (in FIG. 11).
  • ACK (-1, 0) and NACK (1, 0)) and possible phase points (ACK (0, -j) and NACK (0, j) in FIG. 11) that signals assigned to the common resource can take The phase difference (90 degrees in FIG. 11) and the phase points (ACK ( ⁇ 1, 0) and NACK in FIG. 11) that can be taken by the signal allocated to the ACK / NACK resource when only the response signal occurs in a certain subframe. (1, 0)) and the phase point (ACK (-1, 0) and NACK (1, 0) in FIG. 11) that can be taken by the signal allocated to the common resource (In FIG. 11 0 degrees) and made different from each other.
  • terminal 400 has SR resources and common resources when SR and a response signal are generated simultaneously in a certain subframe and when only SR is generated in a certain subframe.
  • the phase difference (0 degree) between (phase point ( ⁇ 1, 0) for ACK / NACK resource and phase point ( ⁇ 1, 0) for common resource) is made different from each other. The same applies to NACK indicating that there is an error.
  • the terminal 400 receives a signal (ACK) having the same content in the SR resource and the common resource when the SR and the response signal are simultaneously generated in a certain subframe and when only the SR is generated in a certain subframe.
  • ACK a signal having the same content in the SR resource and the common resource
  • NACK a signal having the same content in the SR resource and the common resource
  • the same content signal ACK or NACK
  • the phase difference between the phase points is set to a maximum (here, 90 degrees (that is, ⁇ / 2 radians)).
  • the data portion of the common resource is given a phase rotation opposite to that of the terminal 400, whereas the ACK / NACK resource When the likelihood for the common resource set is obtained, no phase rotation is applied to the data portion of the common resource.
  • the base station 300 when a set of SR resources and common resources is used by the terminal 400 (that is, when phase rotation is performed on the common resources in the terminal 400), the correct set of resources (that is, The phase rotation opposite to that of the terminal 400 is performed on the common resource in the SR resource and the common resource set), whereas the common resource in the wrong resource set (that is, the ACK / NACK resource and the common resource set) Do not perform phase rotation on resources.
  • the terminal 400 uses a set of ACK / NACK resources and common resources by the terminal 400 (that is, when phase rotation is not performed on the common resources in the terminal 400)
  • the base station 300 uses the correct resource. Phase rotation is not performed on the common resource in the set (ie ACK / NACK resource and common resource set), whereas the common in the wrong resource set (ie SR resource and common resource set) Perform phase rotation on resources.
  • the signal point of the response signal causes a phase difference corresponding to the amount of phase rotation.
  • the combined result after MRC in the vicinity of the combined phase point ( ⁇ 1, 0)) in the SR resource and common resource set (here, the correct resource set) is the signal point ( ⁇ 1 , 0).
  • the correct resource set is the signal point ( ⁇ 1 , 0).
  • the combined result after MRC in the vicinity of the combined phase point (0, ⁇ j)) in the set of ACK / NACK resource and common resource (here, the wrong set of resources) is the response
  • the phase difference between the signal and the signal point ( ⁇ 1, 0) is approximately 90 degrees ( ⁇ / 2 radians) (the amount of phase rotation given by the terminal 400).
  • the combined result of an incorrect resource set (that is, a resource set not used by the terminal 400) is: There is a high possibility that the signal point of the response signal is greatly separated.
  • the base station 300 determines that the likelihood calculated based on the wrong resource set (for example, the ACK / NACK resource and common resource set shown in FIG. 12B in FIGS. 12A and 12B) is the correct resource.
  • the likelihood is deteriorated more than the likelihood calculated based on the set (for example, in FIGS. 12A and 12B, the set of the SR resource and the common resource illustrated in FIG.
  • FIG. 8B when phase rotation is not performed with a common resource
  • FIG. 12B when phase rotation is performed with a common resource
  • FIG. 12B when phase rotation is performed with a common resource
  • an incorrect resource pair here, an ACK / NACK resource and a common resource pair
  • the likelihood of the wrong resource set in FIG. 12B deteriorates more than the likelihood of the wrong resource set in FIG. 8B. That is, the difference between the likelihood of the correct resource set in FIG. 12A and the likelihood of the incorrect resource set in FIG. 12B is the likelihood of the correct resource set in FIG. 8A and the likelihood of the incorrect resource set in FIG. 8B. Greater than the difference in degrees.
  • the difference in likelihood can be greatly different between the correct resource set and the incorrect resource set. For this reason, it is possible to improve the determination accuracy for determining which of the SR resource and the common resource set and the ACK / NACK resource and the common resource set is used by the terminal 400.
  • the present embodiment as in the first embodiment, even when SCTD is applied to the transmission of the SR and the response signal, it is possible to suppress an increase in the uplink control channel (PUCCH) overhead. In addition, it is possible to improve the determination accuracy of resources used by the terminal in the base station.
  • PUCCH uplink control channel
  • a signal point used for the SR resource may be different from a signal point used for the common resource. For example, two signal points out of four signal points included in a QPSK constellation are used as SR resources, whereas two signal points other than the two signal points used in SR resources are used as common resources. Also good.
  • the phase difference between the phase point that can be taken by the signal assigned to the SR resource and the phase point that can be taken by the signal assigned to the common resource when the SR resource and the common resource are used.
  • a phase difference between a phase point that can be taken by the signal assigned to the ACK / NACK resource and a phase point that can be taken by the signal assigned to the common resource when the ACK / NACK resource and the common resource are used are different from each other.
  • the terminal is used in the base station as in the present embodiment. It is possible to improve the determination accuracy of the resources that have been used.
  • the phase rotation unit 401 may be referred to as a scramble unit.
  • phase rotation that is, multiplication by exp (j ⁇ / 2) which is a scramble code
  • primary spreading and secondary spreading are performed.
  • the order of scramble processing, primary spreading, and secondary spreading is not limited to this. That is, since the scramble process, the first spread and the second spread are all represented by multiplication, for example, after the first spread is performed on the response signal or the second spread is performed, the scramble code is changed. Even if multiplication is performed, the same result as in the present embodiment can be obtained.
  • a typical rotation angle includes ⁇ 90 degrees in addition to 90 degrees (that is, a common resource signal multiplied by exp ( ⁇ j ⁇ / 2)).
  • the embodiment is also in that it handles downlink data (hereinafter referred to as “SPS (Semi-Persistent Scheduling) data”) transmitted from the base station to the terminal without accompanying downlink allocation control information. 2 and different.
  • SPS Semi-Persistent Scheduling
  • FIG. 13 shows the configuration of base station 500 according to the present embodiment.
  • the same components as those of base station 300 shown in FIG. 9 are denoted by the same reference numerals, and description thereof is omitted.
  • the base station 500 shown in FIG. 13 transmits information related to SR resources and downlink data (assignment) assigned to a communication target terminal (terminal 600 (described later) shown in FIG. 14) and SPS (Semi-Persistent Scheduling).
  • SR resources and downlink data assign to a communication target terminal (terminal 600 (described later) shown in FIG. 14) and SPS (Semi-Persistent Scheduling).
  • SPS data Service-Persistent Scheduling
  • SPS ⁇ Service-Persistent Scheduling
  • Information relating to “ACK / NACK resource” is notified in advance.
  • the base station 500 sets in advance for each terminal 600 whether or not the communication target terminal 600 (FIG. 14) should apply SCTD (SORTD) to the uplink control information (that is, SR and response signal) (Configure). is doing.
  • base station 500 notifies terminal 600 set to apply SCTD information about resources (common resources) that are commonly used during SR transmission and response signal transmission simultaneously with the setting.
  • the control unit 501 of the base station 500 determines whether or not to transmit control information together with the terminal 600 when transmitting downlink data. That is, when the downlink data to be transmitted to terminal 600 is “SPS data”, control section 501 allocates the data to downlink resources that have been previously notified to terminal 600, so downlink allocation control information Determines that there is no need to send them together. On the other hand, when the downlink data to be transmitted to terminal 600 is other than the SPS data, and it is necessary to notify terminal 600 of the resource allocation information, control unit 501 determines to transmit the downlink allocation control information together. To do. Furthermore, when transmitting downlink allocation control information to terminal 600 together with downlink data transmission when transmitting downlink data, control unit 501 transmits downlink allocation control information as in the first embodiment. A resource (that is, downlink control information allocation resource) and a downlink resource for transmitting downlink data (that is, downlink data allocation resource) included in the control information are determined.
  • a resource that is, downlink control information allocation resource
  • control section 501 when transmitting the downlink allocation control information together with downlink allocation control information when transmitting downlink data to terminal 600, control section 501 transmits control information to terminal 600 as in the first embodiment.
  • the coding rate to be used for is determined.
  • control section 501 transmits downlink data to control information generation section 102 as in the first embodiment.
  • Information on the allocated resource is output, and information on the coding rate used when transmitting control information is output to the encoding unit 103.
  • control unit 501 outputs the coding rate of transmission data (that is, downlink data) to the coding unit 105. At this time, the control unit 501 outputs the coding rate previously notified to the terminal 600 to the SPS data to the coding unit 105, and for downlink data other than the SPS data, an optimum code at the time of transmission. The conversion rate is determined and output to the encoding unit 105.
  • control unit 501 outputs information related to downlink data allocation resources and downlink control information allocation resources to the mapping unit 108. At this time, the control unit 501 outputs, to the mapping unit 108, information related to downlink data allocation resources that has been previously notified to the terminal 600 for the SPS data. On the other hand, for downlink data other than SPS data, control section 501 outputs information related to downlink control information allocation resources and downlink data allocation resources indicated by downlink allocation control information to mapping section 108.
  • Sequence control section 516 includes SR resources, ACK / NACK resources (that is, resources for response signals for downlink data other than SPS data), SPS-ACK / NACK resources, or data portions of common resources transmitted from terminal 600, and ZAC sequences corresponding to the reference signal portions are generated. Similarly to Embodiment 1, sequence control section 516 specifies a correlation window from which a signal is to be extracted in association with these resources. Then, sequence control unit 516 outputs information indicating the identified correlation window and the generated ZAC sequence to correlation processing unit 117.
  • FIG. 14 shows a configuration of terminal 600 according to the present embodiment.
  • the same components as those of terminal 400 shown in FIG. 10 are denoted by the same reference numerals, and description thereof is omitted.
  • extracting section 604 uses the received signal received from FFT section 203 according to the input coding rate information, as in the first embodiment.
  • a downlink control channel signal (PDCCH signal) is extracted. That is, since the number of CCEs constituting the downlink control information allocation resource changes according to the coding rate, the extraction unit 604 extracts the downlink control channel signal using the number of CCEs corresponding to the coding rate as an extraction unit. .
  • the extracted downlink control channel signal is output to demodulation section 205.
  • the extraction unit 604 downloads data from the received signal based on the information on the downlink data allocation resource addressed to the own device received from the determination unit 207, as in the first embodiment.
  • Line data downlink data channel signal (PDSCH signal)
  • PDSCH signal downlink data channel signal
  • the extraction unit 604 extracts the SPS data (PDSCH signal corresponding to the SPS data) from the received signal based on the input SPS data resource allocation information, and sends it to the demodulation unit 209. Output.
  • the control unit 608 When receiving the SR from the uplink data generation unit (not shown), the control unit 608 performs information corresponding to the SR resource (ZAC sequence, cyclic shift amount, frequency resource information) as in the second embodiment. , The Walsh sequence and the DFT sequence) to the uplink control channel signal generation unit 213-1, and causes the phase rotation unit 401 to rotate the phase of the signal by a preset angle (for example, 90 degrees) (signal Is multiplied by exp (j ⁇ / 2)).
  • a preset angle for example, 90 degrees
  • control section 608 does not receive SR from an uplink data generation section (not shown), and if the response signal to be transmitted is a response signal for data other than SPS data, information corresponding to ACK / NACK resources (ZAC sequence, cyclic shift amount, frequency resource information, Walsh sequence, and DFT sequence) are output to the uplink control channel signal generation unit 213-1 and an instruction signal that does not rotate the phase of the signal is output to the phase rotation unit 401 To do.
  • control unit 608 does not receive the SR from the uplink data generation unit and the response signal to be transmitted is a response signal to the SPS data
  • the information corresponding to the SPS-ACK / NACK resource ZAC sequence, cyclic shift) (Quantity, frequency resource information, Walsh sequence and DFT sequence) are output to uplink control channel signal generation section 213-1 and an instruction signal that does not rotate the phase of the signal is output to phase rotation section 401.
  • Terminal 600 receives SPS data in a subframe notified in advance when SPS data is transmitted from base station 500, blindly determines downlink assignment control information in other subframes, When a downlink assignment control signal is detected, downlink data other than SPS data is received.
  • terminal 600 When terminal 600 receives downlink data other than SPS data, terminal 600 performs uplink signal transmission control based on “operation 1” described later, while terminal 600 receives “operation 2” described later when SPS data is received. Based on the above, uplink signal transmission control is performed.
  • the base station 500 transmits, to the terminal 600, information on SR resources, SPS, in the uplink unit band (uplink unit band set for the terminal 600) illustrated in FIG. -Information about ACK / NACK resources and information about common resources are notified in advance one by one. That is, the control unit 608 of the terminal 600 holds information on SR resources notified from the base station 500, information on SPS-ACK / NACK resources, and information on common resources.
  • SR resource, ACK / NACK resource (not shown), SPS-ACK / NACK resource, and common resource are different from each other in at least one of ZAC sequence (primary spreading) or orthogonal code sequence.
  • Code resource is different from each other in at least one of ZAC sequence (primary spreading) or orthogonal code sequence.
  • the angles preset in the phase rotation unit 301 and the phase rotation unit 401 are set to ⁇ 90 degrees and 90 degrees, respectively.
  • values that are preset in the phase rotation unit 301 and the phase rotation unit 401 and are multiplied by the signal are expressed as exp ( ⁇ j ⁇ / 2) and exp (j ⁇ / 2), respectively.
  • ACK is associated with the phase point (-1, 0)
  • NACK is associated with the phase point (1, 0).
  • terminal 600 transmits a response signal (denoted as “A / N” in FIGS. 15 and 16) to the SPS data using the SR resource and the common resource.
  • the control unit 608 of the terminal 600 controls to transmit the same response signal from the antenna 1 using the SR resource and to transmit from the antenna 2 using the common resource.
  • control unit 608 sends the response signal (response signal for SPS data) input from the CRC unit 211 to the response signal generation unit 212, the modulation unit 221 and the phase rotation unit of the uplink control channel signal generation unit 213-1 401 is instructed to output.
  • the control unit 608 also causes the phase rotation unit 401 to rotate the response signal input from the response signal generation unit 212 by 90 degrees (multiply the response signal by exp (j ⁇ / 2). ) Output the instruction signal.
  • phase rotation unit 401 rotates the phase of the response signal input from the response signal generation unit 212 by 90 degrees (that is, the response signal is multiplied by exp (j ⁇ / 2)).
  • the response signal (“A / N”) of the SR resource As the signal point arrangement, ACK is associated with the phase point (-1, 0) and NACK is associated with the phase point (1, 0).
  • ACK is associated with the phase point (0, ⁇ j) and NACK is the phase point as the signal point arrangement of the response signal (“A / N”). Corresponding to (0, j).
  • the constellation of the response signal allocated to the SR resource and the allocation to the common resource are performed as in the second embodiment. It is 90 degrees different from the constellation of the response signal.
  • terminal 600 transmits a response signal ("A / N") for downlink data using ACK / NACK resources and common resources, as shown in FIG. 15C.
  • control unit 608 of terminal 600 controls to transmit the same response signal from antenna 1 using ACK / NACK resources and to transmit from antenna 2 using common resources.
  • control unit 608 sends the response signal (response signal for SPS data) input from the CRC unit 211 to the response signal generation unit 212, the modulation unit 221 and the phase rotation unit of the uplink control channel signal generation unit 213-1 401 is instructed to output.
  • control unit 608 instructs the phase rotation unit 401 not to rotate the phase of the response signal input from the response signal generation unit 212 (do not multiply the response signal by exp (j ⁇ / 2)). Output a signal.
  • the signal point of the response signal (“A / N”) is used for the SPS-ACK / NACK resource and the common resource.
  • ACK is associated with the phase point ( ⁇ 1, 0)
  • NACK is associated with the phase point (1, 0). That is, when only the response signal for the SPS data is generated in a certain subframe, the constellation of the response signal allocated to the ACK / NACK resource and the response signal allocated to the common resource are the same as in the second embodiment. This constellation is the same.
  • terminal 600 transmits an SR using the same phase point as “NACK” using the SR resource and the common resource, as shown in FIG. 15D.
  • the control unit 608 of the terminal 600 controls to transmit the same SR (NACK) from the antenna 1 using the SR resource and to transmit from the antenna 2 using the common resource.
  • control unit 608 instructs the response signal generation unit 212 to output “NACK” to the modulation unit 221 and the phase rotation unit 401 of the uplink control channel signal generation unit 213-1.
  • the control unit 608 also sets exp (j ⁇ / 2) to the signal (NACK) so that the phase of the signal (NACK) input from the response signal generation unit 212 is rotated by 90 degrees with respect to the phase rotation unit 401.
  • Output instruction signal (to multiply).
  • the signal (NACK) is associated with the phase point (1, 0) in the SR resource.
  • the signal (NACK) is associated with the phase point (0, j). That is, when only SR occurs in a certain subframe, the constellation of SR (NACK) allocated to the SR resource and the constellation of SR (NACK) allocated to the common resource are the same as in the second embodiment. Is 90 degrees different.
  • terminal 600 does not transmit the SR and response signal in the PUCCH resource.
  • terminal 600 has a case where SR occurs and a case where SR does not occur regardless of whether a response signal to SPS data is generated or not in the same subframe, as in the second embodiment.
  • the phase rotation amount of the signal (SR or response signal to SPS data) allocated to the common resource is changed.
  • the terminal 600 has the same signal (ACK signal) in the SR resource and the common resource when the SR and the response signal to the SPS data are simultaneously generated in a certain subframe and when only the SR is generated in the certain subframe.
  • ACK signal the same signal
  • NACK the response signal
  • ACK or NACK a signal having the same content in the ACK / NACK resource and the common resource when only a response signal to SPS data is generated in a certain subframe.
  • the phase difference between the arranged phase points is made different from each other.
  • the likelihood calculated based on the wrong resource set is highly likely to deteriorate more than the likelihood calculated based on the correct resource set. Therefore, in base station 500, as in the second embodiment, the likelihood difference can be greatly varied between the correct resource set and the incorrect resource set. For this reason, it is possible to improve the determination accuracy for determining which of the SR resource and the common resource set and the ACK / NACK resource and the common resource set is used by the terminal 600.
  • the terminal even when the terminal receives SPS data, it is possible to suppress an increase in the uplink control channel (PUCCH) overhead, as in the second embodiment. Thus, it is possible to improve the determination accuracy of resources used by the terminal in the base station.
  • PUCCH uplink control channel
  • the base station 500 may transmit the downlink allocation control information together with the SPS data as necessary. That is, when the base station 500 transmits SPS data by using a resource (or parameter) other than downlink resources (or other parameters (MCS etc.)) previously notified to the terminal 600 for some reason.
  • the downlink allocation control information is transmitted together with the SPS data.
  • the terminal 600 since the terminal side can receive the downlink assignment control information, the terminal 600 specifies an ACK / NACK resource corresponding to the CCE occupied by the downlink assignment control information as a resource for a response signal to the SPS data.
  • the terminal always transmits the uplink control signal by SCTD (SORTD).
  • the base station may be configured (configured) to perform SCTD transmission to the terminal as necessary, and information regarding the common resource may be simultaneously notified when setting the SCTD.
  • the terminal side is instructed to transmit SCTD, the terminal uses the same method as in normal LTE (that is, uses only one of SR resources, SPS-ACK / NACK resources, or ACK / NACK resources). To transmit an uplink control signal.
  • the terminal side may share one of SR resource, SPS-ACK / NACK resource, or ACK / NACK resource, and the common information separately notified from the base station.
  • Signal transmission control by SCTD is performed using resources (that is, a total of two resources).
  • a GCL Generalized Chirp like
  • a CAZAC Constant Amplitude Zero Auto Correlation
  • a ZC Zero Auto Correlation
  • a PN sequence such as an M sequence or an orthogonal gold code sequence
  • a time randomly generated by a computer A sequence having a sharp autocorrelation characteristic on the axis may be used for the first spreading.
  • any sequence may be used as the orthogonal code sequence as long as the sequences are orthogonal to each other or sequences that can be regarded as being substantially orthogonal to each other.
  • the response signal resource (for example, PUCCH resource) is defined by the cyclic shift amount of the ZAC sequence and the sequence number of the orthogonal code sequence.
  • the terminal uses different resources when transmitting only the response signal and when transmitting the SR and the response signal at the same time.
  • the present invention is not limited to the case where the terminal transmits the SR and the response signal.
  • the terminal selects two ACK / NACK resources from among a plurality of ACK / NACK resources and transmits the response signal.
  • the present invention can also be applied when so-called Channel Selection is used.
  • the terminal transmits with one ACK / NACK resource of two selected ACK / NACK resources according to which two ACK / NACK resources are selected from among a plurality of ACK / NACK resources. Whether to rotate the phase of the signal (multiply exp (j ⁇ / 2)) may be controlled.
  • the response signal transmitted from the terminal is modulated by BPSK
  • the present invention can be applied to a case where the response signal is not limited to BPSK but is modulated by QPSK, for example.
  • the terminal rotates the phase of the response signal allocated to the common resource by 45 degrees as shown in FIG. By multiplying exp (j ⁇ / 4)), the same effect as in the above embodiment can be obtained.
  • the antenna is described as an antenna.
  • the present invention can be similarly applied to an antenna port.
  • An antenna port refers to a logical antenna composed of one or more physical antennas. That is, the antenna port does not necessarily indicate one physical antenna, but may indicate an array antenna composed of a plurality of antennas.
  • 3GPP LTE it is not specified how many physical antennas an antenna port is composed of, but it is specified as a minimum unit in which a base station can transmit different reference signals (Reference signal).
  • the antenna port may be defined as a minimum unit for multiplying the weight of a precoding vector (Precoding vector).
  • each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
  • the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
  • An FPGA Field Programmable Gate Array
  • a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
  • the present invention can be applied to a mobile communication system or the like.
  • Control unit 102 Control information generation unit 103, 105 Encoding unit 104, 107, 221 Modulation unit 106 Data transmission control unit 108 Mapping unit 109, 223, 226 IFFT unit 110, 224, 227 CP addition unit 111, 214 Radio transmission unit 112, 201 Radio reception unit 113, 202 CP removal unit 114 PUCCH extraction unit 115 Despreading unit 116, 516 Sequence control unit 117 Correlation processing Unit 118, 207, 318 Judgment unit 119 Retransmission control signal generation unit 203 FFT unit 204, 604 Extraction unit 205, 209 Demodulation unit 206, 210 Decoding unit 211 CRC unit 212 Response signal generation unit 213 Uplink control channel signal generation unit 222, 225 , 22 8 Diffusion unit 229 Multiplexing unit 301, 401 Phase rotation unit

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2010/005071 2009-08-17 2010-08-16 端末装置及び信号送信制御方法 WO2011021380A1 (ja)

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EP10809727.0A EP2469950B1 (de) 2009-08-17 2010-08-16 Endgerät und signalübertragungssteuerverfahren dafür
US13/390,202 US8837402B2 (en) 2009-08-17 2010-08-16 Terminal device and signal transmission control method
JP2011527578A JP5526135B2 (ja) 2009-08-17 2010-08-16 端末装置及び信号送信制御方法

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JP2009-188760 2009-08-17
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WO2010122783A1 (ja) 2009-04-21 2010-10-28 パナソニック株式会社 端末装置及び再送制御方法
JPWO2010146880A1 (ja) * 2009-06-19 2012-12-06 パナソニック株式会社 端末装置および再送制御方法
JP5042331B2 (ja) * 2010-04-05 2012-10-03 株式会社エヌ・ティ・ティ・ドコモ 基地局装置及び方法
US9001641B2 (en) * 2010-10-25 2015-04-07 Texas Instruments Incorporated Sounding reference signal processing for LTE
US9661612B2 (en) * 2012-06-29 2017-05-23 Samsung Electronics Co., Ltd. Methods and apparatus for uplink control channel multiplexing in beamformed cellular systems
JP6443890B2 (ja) * 2014-01-31 2018-12-26 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ 端末、基地局、送信方法及び受信方法
JP7140685B2 (ja) * 2016-12-27 2022-09-21 株式会社Ｎｔｔドコモ 端末、無線通信方法、基地局及びシステム
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EP2469950A1 (de) 2012-06-27
JPWO2011021380A1 (ja) 2013-01-17
EP2469950A4 (de) 2015-03-04
KR20120051014A (ko) 2012-05-21
US8837402B2 (en) 2014-09-16
US20120140728A1 (en) 2012-06-07
JP5526135B2 (ja) 2014-06-18
EP2469950B1 (de) 2018-01-10
KR101640282B1 (ko) 2016-07-15

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